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-   -   Birfield/Aisin Hub Issue (http://www.risingsun4x4club.org/forum2/showthread.php?t=19204)

Dirt Claude 02-27-2013 07:58 AM

Birfield/Aisin Hub Issue
 
5 Attachment(s)
I'm wrapping up the front axle rebuild and disc brake conversion on my 72' FJ40 and ran into a slight issue. The Birfield shaft appears to be too long and won't let the manual dial hub mount onto the hub body.

Here's where I'm at:
- I'm told all the conversion parts came off a Toyota mini-truck, Birfields & hubs as well.
- I installed the mini Birfields onto my 72' inner axles.
- After grinding the lower portion of the axle ball to accept the slightly larger Birfield, the Birfield bell appears to be fully seated inside the axle ball.
- All gaskets and brake backing plate were installed.
- There's about a 1/4" gap between the hub body and the snap ring on the end of the axle shaft.

My first guess is that I have the "short" hub and I need the "long" hub. I wasn’t even aware there were different size hubs until I came across a picture comparing the two. What vehicles came with the long hub?

My second guess was that maybe these new Birfields I have are 76'-78' as they are longer than the 79'+ Birfields. But that couldn't be as I did have to grind out the axle ball to accept the new larger Birfield. If it was 76'-78' then the 72' axle housing would have accepted them without grinding?

subzali 02-27-2013 08:10 AM

Huh. From your description of all the minitruck parts I would have thought everything would work. The longer body Aisin/Asco lockouts came on '76-'78 FJ55s, and I think your only other option would be to find the longer body Warn lockouts for '76-'78 FJ40s/FJ55s.

I don't know if it matters, but is the lockout in the locked or unlocked position when you are trying to install it?

DaveInDenver 02-27-2013 08:15 AM

Are not 76-78 axles longer than the rest? AFAIK the mini truck hub bodies are all the same length, solid axle or IFS. Maybe you need the silver faced hubs from a Pig?

Also the clip in the end of your axle on my truck is right up against the inner sleeve of the hub (what a PITA to get that on, I have to use a cheater bar). That seems to me to indicate the hub is too short, right?

DenCo40 02-27-2013 08:27 AM

I just went through this exact thing. Currently I am installing late model Cryo'd birfs with short Aisin hubs. I have all the parts for it and just waiting for a nice day to change out the parts. I will be getting rid of my long birfs and long body Warn hubs when I am done. In case you are interested.
Long birfs 76-78 will not work with short body Aisin hubs as you can see. Long body Aisin hubs (pig hubs) are out there you just have to find them. One solution that you might be interested in that I saw on MUD, was to cut 10mm off of your long bifs and have a new C ring groove machined in.

http://forum.ih8mud.com/40-55-series...-question.html

Dirt Claude 02-27-2013 08:38 AM

Quote:

Originally Posted by subzali (Post 227964)
Huh. From your description of all the minitruck parts I would have thought everything would work. The longer body Aisin/Asco lockouts came on '76-'78 FJ55s, and I think your only other option would be to find the longer body Warn lockouts for '76-'78 FJ40s/FJ55s.

I don't know if it matters, but is the lockout in the locked or unlocked position when you are trying to install it?

I actually removed all the guts from the lockout and just used the dial, the back of the dial is hitting the axle shaft.

Dirt Claude 02-27-2013 08:43 AM

Quote:

Originally Posted by DaveInDenver (Post 227967)
Are not 76-78 axles longer than the rest? AFAIK the mini truck hub bodies are all the same length, solid axle or IFS. Maybe you need the silver faced hubs from a Pig?

Also the clip in the end of your axle on my truck is right up against the inner sleeve of the hub (what a PITA to get that on, I have to use a cheater bar). That seems to me to indicate the hub is too short, right?

That's been my experience with the c-clip too, but with this setup I've got almost a 1/4" gap between the clip and the hub.

Dirt Claude 02-27-2013 09:34 AM

Quote:

Originally Posted by DenCo40 (Post 227970)
I just went through this exact thing. Currently I am installing late model Cryo'd birfs with short Aisin hubs. I have all the parts for it and just waiting for a nice day to change out the parts. I will be getting rid of my long birfs and long body Warn hubs when I am done. In case you are interested.
Long birfs 76-78 will not work with short body Aisin hubs as you can see. Long body Aisin hubs (pig hubs) are out there you just have to find them. One solution that you might be interested in that I saw on MUD, was to cut 10mm off of your long bifs and have a new C ring groove machined in.

http://forum.ih8mud.com/40-55-series...-question.html

Thanks for the link Jim, I searched MUD quite a bit last night but didn't come across that thread.

So that reconfirms my thought, the birfields I have are likely 76'-78' and will not work with the short lockout hubs. At this point I think I'll try and source some 79'+ birfields rather than stick with the older ones. 79'+ should be easier to find, they're more common as a trail spare, and I can keep my short hubs so they can stay out of the rocks. I may also trim down my current ones and have the new c-clip groove machined in.

Telly 02-27-2013 09:51 AM

I have a short birf if you are interested. See this thread.
http://www.risingsun4x4club.org/foru...ad.php?t=18704

Dirt Claude 02-27-2013 10:55 AM

Quote:

Originally Posted by Telly (Post 227978)
I have a short birf if you are interested. See this thread.
http://www.risingsun4x4club.org/foru...ad.php?t=18704

Thanks for the offer, I may take you up on it.

RicardoJM 02-27-2013 11:43 AM

Brad, I believe that I also have a birf that will work for you.:D


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